Finding the Fourth Proportional to 149,421.98, 206,196.32 and 81,437.50

Step by Step Solution

1. Step 1: Write the proportion equation
   149,421.98 : 206,196.32 = 81,437.50 : x
2. Step 2: Convert to fraction form
   149,421.98/206,196.32 = 81,437.50/x
3. Step 3: Cross multiply
   149,421.98x = 206,196.32 × 81,437.50
4. Step 4: Simplify right side
   149,421.98x = 16,792,112,810
5. Step 5: Solve for x
   x = 16,792,112,810/149,421.98
6. Step 6: Final answer
   x = 112,380.47