Finding the Fourth Proportional to 99,719.56, 137,613.38 and 54,398.54

Step by Step Solution

1. Step 1: Write the proportion equation
   99,719.56 : 137,613.38 = 54,398.54 : x
2. Step 2: Convert to fraction form
   99,719.56/137,613.38 = 54,398.54/x
3. Step 3: Cross multiply
   99,719.56x = 137,613.38 × 54,398.54
4. Step 4: Simplify right side
   99,719.56x = 7,485,966,560.42
5. Step 5: Solve for x
   x = 7,485,966,560.42/99,719.56
6. Step 6: Final answer
   x = 75,070.20