Finding the Fourth Proportional to 704,002.56, 971,517.56 and 398,139

Step by Step Solution

1. Step 1: Write the proportion equation
   704,002.56 : 971,517.56 = 398,139 : x
2. Step 2: Convert to fraction form
   704,002.56/971,517.56 = 398,139/x
3. Step 3: Cross multiply
   704,002.56x = 971,517.56 × 398,139
4. Step 4: Simplify right side
   704,002.56x = 386,799,029,820.84
5. Step 5: Solve for x
   x = 386,799,029,820.84/704,002.56
6. Step 6: Final answer
   x = 549,428.44