Finding the Fourth Proportional to 1,392,264.63, 1,921,207.82 and 772,087.59

Step by Step Solution

1. Step 1: Write the proportion equation
   1,392,264.63 : 1,921,207.82 = 772,087.59 : x
2. Step 2: Convert to fraction form
   1,392,264.63/1,921,207.82 = 772,087.59/x
3. Step 3: Cross multiply
   1,392,264.63x = 1,921,207.82 × 772,087.59
4. Step 4: Simplify right side
   1,392,264.63x = 1,483,340,711,772.52
5. Step 5: Solve for x
   x = 1,483,340,711,772.52/1,392,264.63
6. Step 6: Final answer
   x = 1,065,415.78