Finding the Fourth Proportional to 99,638.56, 149,501.86 and 52,242.32

Step by Step Solution

1. Step 1: Write the proportion equation
   99,638.56 : 149,501.86 = 52,242.32 : x
2. Step 2: Convert to fraction form
   99,638.56/149,501.86 = 52,242.32/x
3. Step 3: Cross multiply
   99,638.56x = 149,501.86 × 52,242.32
4. Step 4: Simplify right side
   99,638.56x = 7,810,324,010.72
5. Step 5: Solve for x
   x = 7,810,324,010.72/99,638.56
6. Step 6: Final answer
   x = 78,386.56