Finding the Fourth Proportional to 1,392,019.56, 1,921,121.82 and 780,276.24

Step by Step Solution

1. Step 1: Write the proportion equation
   1,392,019.56 : 1,921,121.82 = 780,276.24 : x
2. Step 2: Convert to fraction form
   1,392,019.56/1,921,121.82 = 780,276.24/x
3. Step 3: Cross multiply
   1,392,019.56x = 1,921,121.82 × 780,276.24
4. Step 4: Simplify right side
   1,392,019.56x = 1,499,005,710,291.56
5. Step 5: Solve for x
   x = 1,499,005,710,291.56/1,392,019.56
6. Step 6: Final answer
   x = 1,076,856.79