Finding the Fourth Proportional to 983,056.83, 1,356,839.69 and 643,328.25

Step by Step Solution

1. Step 1: Write the proportion equation
   983,056.83 : 1,356,839.69 = 643,328.25 : x
2. Step 2: Convert to fraction form
   983,056.83/1,356,839.69 = 643,328.25/x
3. Step 3: Cross multiply
   983,056.83x = 1,356,839.69 × 643,328.25
4. Step 4: Simplify right side
   983,056.83x = 872,893,300,081.60
5. Step 5: Solve for x
   x = 872,893,300,081.60/983,056.83
6. Step 6: Final answer
   x = 887,937.78