Finding the Fourth Proportional to 388,186,807.33, 582,085,499.95 and 129,311,014.69

Step by Step Solution

1. Step 1: Write the proportion equation
   388,186,807.33 : 582,085,499.95 = 129,311,014.69 : x
2. Step 2: Convert to fraction form
   388,186,807.33/582,085,499.95 = 129,311,014.69/x
3. Step 3: Cross multiply
   388,186,807.33x = 582,085,499.95 × 129,311,014.69
4. Step 4: Simplify right side
   388,186,807.33x = 75,270,066,634,870,448
5. Step 5: Solve for x
   x = 75,270,066,634,870,448/388,186,807.33
6. Step 6: Final answer
   x = 193,901,660.78