Finding the Fourth Proportional to 99,072.26, 136,719.72 and 56,631.72

Step by Step Solution

1. Step 1: Write the proportion equation
   99,072.26 : 136,719.72 = 56,631.72 : x
2. Step 2: Convert to fraction form
   99,072.26/136,719.72 = 56,631.72/x
3. Step 3: Cross multiply
   99,072.26x = 136,719.72 × 56,631.72
4. Step 4: Simplify right side
   99,072.26x = 7,742,672,901.52
5. Step 5: Solve for x
   x = 7,742,672,901.52/99,072.26
6. Step 6: Final answer
   x = 78,151.77