Finding the Fourth Proportional to 1,187,150.88, 1,638,298.28 and 728,518.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,187,150.88 : 1,638,298.28 = 728,518.72 : x
2. Step 2: Convert to fraction form
   1,187,150.88/1,638,298.28 = 728,518.72/x
3. Step 3: Cross multiply
   1,187,150.88x = 1,638,298.28 × 728,518.72
4. Step 4: Simplify right side
   1,187,150.88x = 1,193,530,965,923.80
5. Step 5: Solve for x
   x = 1,193,530,965,923.80/1,187,150.88
6. Step 6: Final answer
   x = 1,005,374.28