Finding the Fourth Proportional to 99,719.27, 137,610.18 and 57,280.53

Step by Step Solution

1. Step 1: Write the proportion equation
   99,719.27 : 137,610.18 = 57,280.53 : x
2. Step 2: Convert to fraction form
   99,719.27/137,610.18 = 57,280.53/x
3. Step 3: Cross multiply
   99,719.27x = 137,610.18 × 57,280.53
4. Step 4: Simplify right side
   99,719.27x = 7,882,384,043.80
5. Step 5: Solve for x
   x = 7,882,384,043.80/99,719.27
6. Step 6: Final answer
   x = 79,045.75