Finding the Fourth Proportional to 1,144,368.72, 1,578,863.52 and 660,870

Step by Step Solution

1. Step 1: Write the proportion equation
   1,144,368.72 : 1,578,863.52 = 660,870 : x
2. Step 2: Convert to fraction form
   1,144,368.72/1,578,863.52 = 660,870/x
3. Step 3: Cross multiply
   1,144,368.72x = 1,578,863.52 × 660,870
4. Step 4: Simplify right side
   1,144,368.72x = 1,043,423,534,462.40
5. Step 5: Solve for x
   x = 1,043,423,534,462.40/1,144,368.72
6. Step 6: Final answer
   x = 911,789.63