Finding the Fourth Proportional to 1,128,680.72, 1,557,624.32 and 619,401.32

Step by Step Solution

1. Step 1: Write the proportion equation
   1,128,680.72 : 1,557,624.32 = 619,401.32 : x
2. Step 2: Convert to fraction form
   1,128,680.72/1,557,624.32 = 619,401.32/x
3. Step 3: Cross multiply
   1,128,680.72x = 1,557,624.32 × 619,401.32
4. Step 4: Simplify right side
   1,128,680.72x = 964,794,559,872.10
5. Step 5: Solve for x
   x = 964,794,559,872.10/1,128,680.72
6. Step 6: Final answer
   x = 854,798.48