Finding the Fourth Proportional to 42,128.91, 63,204.91 and 18,432.16

Step by Step Solution

1. Step 1: Write the proportion equation
   42,128.91 : 63,204.91 = 18,432.16 : x
2. Step 2: Convert to fraction form
   42,128.91/63,204.91 = 18,432.16/x
3. Step 3: Cross multiply
   42,128.91x = 63,204.91 × 18,432.16
4. Step 4: Simplify right side
   42,128.91x = 1,165,002,809.81
5. Step 5: Solve for x
   x = 1,165,002,809.81/42,128.91
6. Step 6: Final answer
   x = 27,653.29