Finding the Fourth Proportional to 42,369.38, 63,554.52 and 12,787.47

Step by Step Solution

1. Step 1: Write the proportion equation
   42,369.38 : 63,554.52 = 12,787.47 : x
2. Step 2: Convert to fraction form
   42,369.38/63,554.52 = 12,787.47/x
3. Step 3: Cross multiply
   42,369.38x = 63,554.52 × 12,787.47
4. Step 4: Simplify right side
   42,369.38x = 812,701,565.82
5. Step 5: Solve for x
   x = 812,701,565.82/42,369.38
6. Step 6: Final answer
   x = 19,181.34