Finding the Fourth Proportional to 105,103.61, 145,046.04 and 57,360.04

Step by Step Solution

1. Step 1: Write the proportion equation
   105,103.61 : 145,046.04 = 57,360.04 : x
2. Step 2: Convert to fraction form
   105,103.61/145,046.04 = 57,360.04/x
3. Step 3: Cross multiply
   105,103.61x = 145,046.04 × 57,360.04
4. Step 4: Simplify right side
   105,103.61x = 8,319,845,931.01
5. Step 5: Solve for x
   x = 8,319,845,931.01/105,103.61
6. Step 6: Final answer
   x = 79,158.52