Finding the Fourth Proportional to 660,716.34, 911,632.37 and 388,796.10

Step by Step Solution

1. Step 1: Write the proportion equation
   660,716.34 : 911,632.37 = 388,796.10 : x
2. Step 2: Convert to fraction form
   660,716.34/911,632.37 = 388,796.10/x
3. Step 3: Cross multiply
   660,716.34x = 911,632.37 × 388,796.10
4. Step 4: Simplify right side
   660,716.34x = 354,439,108,145.78
5. Step 5: Solve for x
   x = 354,439,108,145.78/660,716.34
6. Step 6: Final answer
   x = 536,446.71