Finding the Fourth Proportional to 1,392,009.87, 1,921,132.98 and 780,327.84

Step by Step Solution

1. Step 1: Write the proportion equation
   1,392,009.87 : 1,921,132.98 = 780,327.84 : x
2. Step 2: Convert to fraction form
   1,392,009.87/1,921,132.98 = 780,327.84/x
3. Step 3: Cross multiply
   1,392,009.87x = 1,921,132.98 × 780,327.84
4. Step 4: Simplify right side
   1,392,009.87x = 1,499,113,548,636.16
5. Step 5: Solve for x
   x = 1,499,113,548,636.16/1,392,009.87
6. Step 6: Final answer
   x = 1,076,941.75