Finding the Fourth Proportional to 1,392,103.23, 1,921,155.15 and 780,267.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,392,103.23 : 1,921,155.15 = 780,267.18 : x
2. Step 2: Convert to fraction form
   1,392,103.23/1,921,155.15 = 780,267.18/x
3. Step 3: Cross multiply
   1,392,103.23x = 1,921,155.15 × 780,267.18
4. Step 4: Simplify right side
   1,392,103.23x = 1,499,014,311,232.98
5. Step 5: Solve for x
   x = 1,499,014,311,232.98/1,392,103.23
6. Step 6: Final answer
   x = 1,076,798.24