Finding the Fourth Proportional to 152,807.50, 210,875.97 and 85,739.50

Step by Step Solution

1. Step 1: Write the proportion equation
   152,807.50 : 210,875.97 = 85,739.50 : x
2. Step 2: Convert to fraction form
   152,807.50/210,875.97 = 85,739.50/x
3. Step 3: Cross multiply
   152,807.50x = 210,875.97 × 85,739.50
4. Step 4: Simplify right side
   152,807.50x = 18,080,400,229.82
5. Step 5: Solve for x
   x = 18,080,400,229.82/152,807.50
6. Step 6: Final answer
   x = 118,321.42