Finding the Fourth Proportional to 131,396.50, 181,327.98 and 71,780.50

Step by Step Solution

1. Step 1: Write the proportion equation
   131,396.50 : 181,327.98 = 71,780.50 : x
2. Step 2: Convert to fraction form
   131,396.50/181,327.98 = 71,780.50/x
3. Step 3: Cross multiply
   131,396.50x = 181,327.98 × 71,780.50
4. Step 4: Simplify right side
   131,396.50x = 13,015,813,068.39
5. Step 5: Solve for x
   x = 13,015,813,068.39/131,396.50
6. Step 6: Final answer
   x = 99,057.53