Finding the Fourth Proportional to 1,381.47, 2,072.51 and 688.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,381.47 : 2,072.51 = 688.52 : x
2. Step 2: Convert to fraction form
   1,381.47/2,072.51 = 688.52/x
3. Step 3: Cross multiply
   1,381.47x = 2,072.51 × 688.52
4. Step 4: Simplify right side
   1,381.47x = 1,426,950.78
5. Step 5: Solve for x
   x = 1,426,950.78/1,381.47
6. Step 6: Final answer
   x = 1,032.92