Finding the Fourth Proportional to 78,453.12, 108,265.50 and 42,643.08

Step by Step Solution

1. Step 1: Write the proportion equation
   78,453.12 : 108,265.50 = 42,643.08 : x
2. Step 2: Convert to fraction form
   78,453.12/108,265.50 = 42,643.08/x
3. Step 3: Cross multiply
   78,453.12x = 108,265.50 × 42,643.08
4. Step 4: Simplify right side
   78,453.12x = 4,616,774,377.74
5. Step 5: Solve for x
   x = 4,616,774,377.74/78,453.12
6. Step 6: Final answer
   x = 58,847.56