Finding the Fourth Proportional to 105,392.84, 145,442.28 and 57,646.04

Step by Step Solution

1. Step 1: Write the proportion equation
   105,392.84 : 145,442.28 = 57,646.04 : x
2. Step 2: Convert to fraction form
   105,392.84/145,442.28 = 57,646.04/x
3. Step 3: Cross multiply
   105,392.84x = 145,442.28 × 57,646.04
4. Step 4: Simplify right side
   105,392.84x = 8,384,171,490.57
5. Step 5: Solve for x
   x = 8,384,171,490.57/105,392.84
6. Step 6: Final answer
   x = 79,551.62