Finding the Fourth Proportional to 2,031.18, 3,047.34 and 781.62

Step by Step Solution

1. Step 1: Write the proportion equation
   2,031.18 : 3,047.34 = 781.62 : x
2. Step 2: Convert to fraction form
   2,031.18/3,047.34 = 781.62/x
3. Step 3: Cross multiply
   2,031.18x = 3,047.34 × 781.62
4. Step 4: Simplify right side
   2,031.18x = 2,381,861.89
5. Step 5: Solve for x
   x = 2,381,861.89/2,031.18
6. Step 6: Final answer
   x = 1,172.65