Finding the Fourth Proportional to 72,426.30, 108,688.05 and 42,812.70

Step by Step Solution

1. Step 1: Write the proportion equation
   72,426.30 : 108,688.05 = 42,812.70 : x
2. Step 2: Convert to fraction form
   72,426.30/108,688.05 = 42,812.70/x
3. Step 3: Cross multiply
   72,426.30x = 108,688.05 × 42,812.70
4. Step 4: Simplify right side
   72,426.30x = 4,653,228,878.24
5. Step 5: Solve for x
   x = 4,653,228,878.24/72,426.30
6. Step 6: Final answer
   x = 64,247.78