Finding the Fourth Proportional to 42,875.38, 64,278.72 and 20,374.76

Step by Step Solution

1. Step 1: Write the proportion equation
   42,875.38 : 64,278.72 = 20,374.76 : x
2. Step 2: Convert to fraction form
   42,875.38/64,278.72 = 20,374.76/x
3. Step 3: Cross multiply
   42,875.38x = 64,278.72 × 20,374.76
4. Step 4: Simplify right side
   42,875.38x = 1,309,663,645.53
5. Step 5: Solve for x
   x = 1,309,663,645.53/42,875.38
6. Step 6: Final answer
   x = 30,545.82