Finding the Fourth Proportional to 2,921.31, 4,381.37 and 1,071.80

Step by Step Solution

1. Step 1: Write the proportion equation
   2,921.31 : 4,381.37 = 1,071.80 : x
2. Step 2: Convert to fraction form
   2,921.31/4,381.37 = 1,071.80/x
3. Step 3: Cross multiply
   2,921.31x = 4,381.37 × 1,071.80
4. Step 4: Simplify right side
   2,921.31x = 4,695,925.10
5. Step 5: Solve for x
   x = 4,695,925.10/2,921.31
6. Step 6: Final answer
   x = 1,607.47