Finding the Fourth Proportional to 1,290,498.24, 1,780,411.68 and 781,014.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,290,498.24 : 1,780,411.68 = 781,014.72 : x
2. Step 2: Convert to fraction form
   1,290,498.24/1,780,411.68 = 781,014.72/x
3. Step 3: Cross multiply
   1,290,498.24x = 1,780,411.68 × 781,014.72
4. Step 4: Simplify right side
   1,290,498.24x = 1,390,527,729,739.93
5. Step 5: Solve for x
   x = 1,390,527,729,739.93/1,290,498.24
6. Step 6: Final answer
   x = 1,077,512.30