Finding the Fourth Proportional to 78,288.88, 108,037.80 and 42,479.68

Step by Step Solution

1. Step 1: Write the proportion equation
   78,288.88 : 108,037.80 = 42,479.68 : x
2. Step 2: Convert to fraction form
   78,288.88/108,037.80 = 42,479.68/x
3. Step 3: Cross multiply
   78,288.88x = 108,037.80 × 42,479.68
4. Step 4: Simplify right side
   78,288.88x = 4,589,411,171.90
5. Step 5: Solve for x
   x = 4,589,411,171.90/78,288.88
6. Step 6: Final answer
   x = 58,621.49