Finding the Fourth Proportional to 99,365.32, 137,087.40 and 59,080.78

Step by Step Solution

1. Step 1: Write the proportion equation
   99,365.32 : 137,087.40 = 59,080.78 : x
2. Step 2: Convert to fraction form
   99,365.32/137,087.40 = 59,080.78/x
3. Step 3: Cross multiply
   99,365.32x = 137,087.40 × 59,080.78
4. Step 4: Simplify right side
   99,365.32x = 8,099,230,520.17
5. Step 5: Solve for x
   x = 8,099,230,520.17/99,365.32
6. Step 6: Final answer
   x = 81,509.63