Finding the Fourth Proportional to 78,724.29, 108,637.35 and 42,915

Step by Step Solution

1. Step 1: Write the proportion equation
   78,724.29 : 108,637.35 = 42,915 : x
2. Step 2: Convert to fraction form
   78,724.29/108,637.35 = 42,915/x
3. Step 3: Cross multiply
   78,724.29x = 108,637.35 × 42,915
4. Step 4: Simplify right side
   78,724.29x = 4,662,171,875.25
5. Step 5: Solve for x
   x = 4,662,171,875.25/78,724.29
6. Step 6: Final answer
   x = 59,221.52