Finding the Fourth Proportional to 1,272.72, 1,908.12 and 656.16

Step by Step Solution

1. Step 1: Write the proportion equation
   1,272.72 : 1,908.12 = 656.16 : x
2. Step 2: Convert to fraction form
   1,272.72/1,908.12 = 656.16/x
3. Step 3: Cross multiply
   1,272.72x = 1,908.12 × 656.16
4. Step 4: Simplify right side
   1,272.72x = 1,252,032.02
5. Step 5: Solve for x
   x = 1,252,032.02/1,272.72
6. Step 6: Final answer
   x = 983.75