Finding the Fourth Proportional to 78,615.18, 108,486.42 and 42,804.90

Step by Step Solution

1. Step 1: Write the proportion equation
   78,615.18 : 108,486.42 = 42,804.90 : x
2. Step 2: Convert to fraction form
   78,615.18/108,486.42 = 42,804.90/x
3. Step 3: Cross multiply
   78,615.18x = 108,486.42 × 42,804.90
4. Step 4: Simplify right side
   78,615.18x = 4,643,750,359.46
5. Step 5: Solve for x
   x = 4,643,750,359.46/78,615.18
6. Step 6: Final answer
   x = 59,069.39