Finding the Fourth Proportional to 99,543.45, 137,367.57 and 57,099.18

Step by Step Solution

1. Step 1: Write the proportion equation
   99,543.45 : 137,367.57 = 57,099.18 : x
2. Step 2: Convert to fraction form
   99,543.45/137,367.57 = 57,099.18/x
3. Step 3: Cross multiply
   99,543.45x = 137,367.57 × 57,099.18
4. Step 4: Simplify right side
   99,543.45x = 7,843,575,605.59
5. Step 5: Solve for x
   x = 7,843,575,605.59/99,543.45
6. Step 6: Final answer
   x = 78,795.50