Finding the Fourth Proportional to 2,920.59, 4,381.35 and 1,071.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,920.59 : 4,381.35 = 1,071.30 : x
2. Step 2: Convert to fraction form
   2,920.59/4,381.35 = 1,071.30/x
3. Step 3: Cross multiply
   2,920.59x = 4,381.35 × 1,071.30
4. Step 4: Simplify right side
   2,920.59x = 4,693,740.26
5. Step 5: Solve for x
   x = 4,693,740.26/2,920.59
6. Step 6: Final answer
   x = 1,607.12