Finding the Fourth Proportional to 78,429.76, 108,230.88 and 42,618.58

Step by Step Solution

1. Step 1: Write the proportion equation
   78,429.76 : 108,230.88 = 42,618.58 : x
2. Step 2: Convert to fraction form
   78,429.76/108,230.88 = 42,618.58/x
3. Step 3: Cross multiply
   78,429.76x = 108,230.88 × 42,618.58
4. Step 4: Simplify right side
   78,429.76x = 4,612,646,417.75
5. Step 5: Solve for x
   x = 4,612,646,417.75/78,429.76
6. Step 6: Final answer
   x = 58,812.45