Finding the Fourth Proportional to 78,303.12, 108,057.72 and 42,492.20

Step by Step Solution

1. Step 1: Write the proportion equation
   78,303.12 : 108,057.72 = 42,492.20 : x
2. Step 2: Convert to fraction form
   78,303.12/108,057.72 = 42,492.20/x
3. Step 3: Cross multiply
   78,303.12x = 108,057.72 × 42,492.20
4. Step 4: Simplify right side
   78,303.12x = 4,591,610,249.78
5. Step 5: Solve for x
   x = 4,591,610,249.78/78,303.12
6. Step 6: Final answer
   x = 58,638.92