Finding the Fourth Proportional to 105,123.40, 157,425.90 and 69,872.20

Step by Step Solution

1. Step 1: Write the proportion equation
   105,123.40 : 157,425.90 = 69,872.20 : x
2. Step 2: Convert to fraction form
   105,123.40/157,425.90 = 69,872.20/x
3. Step 3: Cross multiply
   105,123.40x = 157,425.90 × 69,872.20
4. Step 4: Simplify right side
   105,123.40x = 10,999,693,969.98
5. Step 5: Solve for x
   x = 10,999,693,969.98/105,123.40
6. Step 6: Final answer
   x = 104,636.02