Finding the Fourth Proportional to 1,246.32, 1,719.89 and 686.79

Step by Step Solution

1. Step 1: Write the proportion equation
   1,246.32 : 1,719.89 = 686.79 : x
2. Step 2: Convert to fraction form
   1,246.32/1,719.89 = 686.79/x
3. Step 3: Cross multiply
   1,246.32x = 1,719.89 × 686.79
4. Step 4: Simplify right side
   1,246.32x = 1,181,199.82
5. Step 5: Solve for x
   x = 1,181,199.82/1,246.32
6. Step 6: Final answer
   x = 947.75