Finding the Fourth Proportional to 99,573.63, 137,411.55 and 54,861.63

Step by Step Solution

1. Step 1: Write the proportion equation
   99,573.63 : 137,411.55 = 54,861.63 : x
2. Step 2: Convert to fraction form
   99,573.63/137,411.55 = 54,861.63/x
3. Step 3: Cross multiply
   99,573.63x = 137,411.55 × 54,861.63
4. Step 4: Simplify right side
   99,573.63x = 7,538,621,613.83
5. Step 5: Solve for x
   x = 7,538,621,613.83/99,573.63
6. Step 6: Final answer
   x = 75,709.02