Finding the Fourth Proportional to 78,730.08, 108,646.72 and 42,920

Step by Step Solution

1. Step 1: Write the proportion equation
   78,730.08 : 108,646.72 = 42,920 : x
2. Step 2: Convert to fraction form
   78,730.08/108,646.72 = 42,920/x
3. Step 3: Cross multiply
   78,730.08x = 108,646.72 × 42,920
4. Step 4: Simplify right side
   78,730.08x = 4,663,117,222.40
5. Step 5: Solve for x
   x = 4,663,117,222.40/78,730.08
6. Step 6: Final answer
   x = 59,229.17