Finding the Fourth Proportional to 69,144.72, 103,635.06 and 61,173.10

Step by Step Solution

1. Step 1: Write the proportion equation
   69,144.72 : 103,635.06 = 61,173.10 : x
2. Step 2: Convert to fraction form
   69,144.72/103,635.06 = 61,173.10/x
3. Step 3: Cross multiply
   69,144.72x = 103,635.06 × 61,173.10
4. Step 4: Simplify right side
   69,144.72x = 6,339,677,888.89
5. Step 5: Solve for x
   x = 6,339,677,888.89/69,144.72
6. Step 6: Final answer
   x = 91,687.09