Finding the Fourth Proportional to 1,315,805.83, 1,972,118.31 and 640,875.76

Step by Step Solution

1. Step 1: Write the proportion equation
   1,315,805.83 : 1,972,118.31 = 640,875.76 : x
2. Step 2: Convert to fraction form
   1,315,805.83/1,972,118.31 = 640,875.76/x
3. Step 3: Cross multiply
   1,315,805.83x = 1,972,118.31 × 640,875.76
4. Step 4: Simplify right side
   1,315,805.83x = 1,263,882,820,731.17
5. Step 5: Solve for x
   x = 1,263,882,820,731.17/1,315,805.83
6. Step 6: Final answer
   x = 960,539.00