Finding the Fourth Proportional to 99,409.56, 137,139.98 and 59,100.45

Step by Step Solution

1. Step 1: Write the proportion equation
   99,409.56 : 137,139.98 = 59,100.45 : x
2. Step 2: Convert to fraction form
   99,409.56/137,139.98 = 59,100.45/x
3. Step 3: Cross multiply
   99,409.56x = 137,139.98 × 59,100.45
4. Step 4: Simplify right side
   99,409.56x = 8,105,034,530.99
5. Step 5: Solve for x
   x = 8,105,034,530.99/99,409.56
6. Step 6: Final answer
   x = 81,531.74