Finding the Fourth Proportional to 500,744, 691,026.72 and 288,776

Step by Step Solution

1. Step 1: Write the proportion equation
   500,744 : 691,026.72 = 288,776 : x
2. Step 2: Convert to fraction form
   500,744/691,026.72 = 288,776/x
3. Step 3: Cross multiply
   500,744x = 691,026.72 × 288,776
4. Step 4: Simplify right side
   500,744x = 199,551,932,094.72
5. Step 5: Solve for x
   x = 199,551,932,094.72/500,744
6. Step 6: Final answer
   x = 398,510.88