Finding the Fourth Proportional to 78,478.43, 108,302.42 and 42,670.90

Step by Step Solution

1. Step 1: Write the proportion equation
   78,478.43 : 108,302.42 = 42,670.90 : x
2. Step 2: Convert to fraction form
   78,478.43/108,302.42 = 42,670.90/x
3. Step 3: Cross multiply
   78,478.43x = 108,302.42 × 42,670.90
4. Step 4: Simplify right side
   78,478.43x = 4,621,360,978.71
5. Step 5: Solve for x
   x = 4,621,360,978.71/78,478.43
6. Step 6: Final answer
   x = 58,887.02