Finding the Fourth Proportional to 3,156.50, 4,355.91 and 1,978.22

Step by Step Solution

1. Step 1: Write the proportion equation
   3,156.50 : 4,355.91 = 1,978.22 : x
2. Step 2: Convert to fraction form
   3,156.50/4,355.91 = 1,978.22/x
3. Step 3: Cross multiply
   3,156.50x = 4,355.91 × 1,978.22
4. Step 4: Simplify right side
   3,156.50x = 8,616,959.17
5. Step 5: Solve for x
   x = 8,616,959.17/3,156.50
6. Step 6: Final answer
   x = 2,729.91