Finding the Fourth Proportional to 388,870.88, 536,642.01 and 210,022.88

Step by Step Solution

1. Step 1: Write the proportion equation
   388,870.88 : 536,642.01 = 210,022.88 : x
2. Step 2: Convert to fraction form
   388,870.88/536,642.01 = 210,022.88/x
3. Step 3: Cross multiply
   388,870.88x = 536,642.01 × 210,022.88
4. Step 4: Simplify right side
   388,870.88x = 112,707,097,785.98
5. Step 5: Solve for x
   x = 112,707,097,785.98/388,870.88
6. Step 6: Final answer
   x = 289,831.68