Finding the Fourth Proportional to 1,285,139.10, 1,773,502.23 and 712,188.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,285,139.10 : 1,773,502.23 = 712,188.78 : x
2. Step 2: Convert to fraction form
   1,285,139.10/1,773,502.23 = 712,188.78/x
3. Step 3: Cross multiply
   1,285,139.10x = 1,773,502.23 × 712,188.78
4. Step 4: Simplify right side
   1,285,139.10x = 1,263,068,389,510.98
5. Step 5: Solve for x
   x = 1,263,068,389,510.98/1,285,139.10
6. Step 6: Final answer
   x = 982,826.21