Finding the Fourth Proportional to 1,128,618.52, 1,557,492.72 and 645,194.32

Step by Step Solution

1. Step 1: Write the proportion equation
   1,128,618.52 : 1,557,492.72 = 645,194.32 : x
2. Step 2: Convert to fraction form
   1,128,618.52/1,557,492.72 = 645,194.32/x
3. Step 3: Cross multiply
   1,128,618.52x = 1,557,492.72 × 645,194.32
4. Step 4: Simplify right side
   1,128,618.52x = 1,004,885,456,385.35
5. Step 5: Solve for x
   x = 1,004,885,456,385.35/1,128,618.52
6. Step 6: Final answer
   x = 890,367.68