Finding the Fourth Proportional to 1,315,680.72, 1,815,639.36 and 712,068.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,315,680.72 : 1,815,639.36 = 712,068.72 : x
2. Step 2: Convert to fraction form
   1,315,680.72/1,815,639.36 = 712,068.72/x
3. Step 3: Cross multiply
   1,315,680.72x = 1,815,639.36 × 712,068.72
4. Step 4: Simplify right side
   1,315,680.72x = 1,292,859,995,056.82
5. Step 5: Solve for x
   x = 1,292,859,995,056.82/1,315,680.72
6. Step 6: Final answer
   x = 982,654.82