Finding the Fourth Proportional to 42,488.04, 63,732.04 and 12,905.76

Step by Step Solution

1. Step 1: Write the proportion equation
   42,488.04 : 63,732.04 = 12,905.76 : x
2. Step 2: Convert to fraction form
   42,488.04/63,732.04 = 12,905.76/x
3. Step 3: Cross multiply
   42,488.04x = 63,732.04 × 12,905.76
4. Step 4: Simplify right side
   42,488.04x = 822,510,412.55
5. Step 5: Solve for x
   x = 822,510,412.55/42,488.04
6. Step 6: Final answer
   x = 19,358.63