Finding the Fourth Proportional to 99,300.76, 137,037.71 and 53,981.78

Step by Step Solution

1. Step 1: Write the proportion equation
   99,300.76 : 137,037.71 = 53,981.78 : x
2. Step 2: Convert to fraction form
   99,300.76/137,037.71 = 53,981.78/x
3. Step 3: Cross multiply
   99,300.76x = 137,037.71 × 53,981.78
4. Step 4: Simplify right side
   99,300.76x = 7,397,539,990.47
5. Step 5: Solve for x
   x = 7,397,539,990.47/99,300.76
6. Step 6: Final answer
   x = 74,496.31