Finding the Fourth Proportional to 1,538.91, 2,124.14 and 1,224.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,538.91 : 2,124.14 = 1,224.72 : x
2. Step 2: Convert to fraction form
   1,538.91/2,124.14 = 1,224.72/x
3. Step 3: Cross multiply
   1,538.91x = 2,124.14 × 1,224.72
4. Step 4: Simplify right side
   1,538.91x = 2,601,470.62
5. Step 5: Solve for x
   x = 2,601,470.62/1,538.91
6. Step 6: Final answer
   x = 1,690.46