Finding the Fourth Proportional to 1,685.72, 2,529.12 and 761.96

Step by Step Solution

1. Step 1: Write the proportion equation
   1,685.72 : 2,529.12 = 761.96 : x
2. Step 2: Convert to fraction form
   1,685.72/2,529.12 = 761.96/x
3. Step 3: Cross multiply
   1,685.72x = 2,529.12 × 761.96
4. Step 4: Simplify right side
   1,685.72x = 1,927,088.28
5. Step 5: Solve for x
   x = 1,927,088.28/1,685.72
6. Step 6: Final answer
   x = 1,143.18