Finding the Fourth Proportional to 99,072.56, 136,717.80 and 56,630.72

Step by Step Solution

1. Step 1: Write the proportion equation
   99,072.56 : 136,717.80 = 56,630.72 : x
2. Step 2: Convert to fraction form
   99,072.56/136,717.80 = 56,630.72/x
3. Step 3: Cross multiply
   99,072.56x = 136,717.80 × 56,630.72
4. Step 4: Simplify right side
   99,072.56x = 7,742,427,450.82
5. Step 5: Solve for x
   x = 7,742,427,450.82/99,072.56
6. Step 6: Final answer
   x = 78,149.06