Finding the Fourth Proportional to 1,320,651.52, 1,980,715.20 and 646,443.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,320,651.52 : 1,980,715.20 = 646,443.52 : x
2. Step 2: Convert to fraction form
   1,320,651.52/1,980,715.20 = 646,443.52/x
3. Step 3: Cross multiply
   1,320,651.52x = 1,980,715.20 × 646,443.52
4. Step 4: Simplify right side
   1,320,651.52x = 1,280,420,506,005.50
5. Step 5: Solve for x
   x = 1,280,420,506,005.50/1,320,651.52
6. Step 6: Final answer
   x = 969,536.99