Finding the Fourth Proportional to 105,128, 145,082.56 and 60,418.88

Step by Step Solution

1. Step 1: Write the proportion equation
   105,128 : 145,082.56 = 60,418.88 : x
2. Step 2: Convert to fraction form
   105,128/145,082.56 = 60,418.88/x
3. Step 3: Cross multiply
   105,128x = 145,082.56 × 60,418.88
4. Step 4: Simplify right side
   105,128x = 8,765,725,782.73
5. Step 5: Solve for x
   x = 8,765,725,782.73/105,128
6. Step 6: Final answer
   x = 83,381.46