Finding the Fourth Proportional to 1,140,380.12, 1,573,728.72 and 617,090.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,140,380.12 : 1,573,728.72 = 617,090.72 : x
2. Step 2: Convert to fraction form
   1,140,380.12/1,573,728.72 = 617,090.72/x
3. Step 3: Cross multiply
   1,140,380.12x = 1,573,728.72 × 617,090.72
4. Step 4: Simplify right side
   1,140,380.12x = 971,133,388,909.48
5. Step 5: Solve for x
   x = 971,133,388,909.48/1,140,380.12
6. Step 6: Final answer
   x = 851,587.44