Finding the Fourth Proportional to 1,245.88, 1,719.27 and 686.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,245.88 : 1,719.27 = 686.34 : x
2. Step 2: Convert to fraction form
   1,245.88/1,719.27 = 686.34/x
3. Step 3: Cross multiply
   1,245.88x = 1,719.27 × 686.34
4. Step 4: Simplify right side
   1,245.88x = 1,180,003.77
5. Step 5: Solve for x
   x = 1,180,003.77/1,245.88
6. Step 6: Final answer
   x = 947.12