Finding the Fourth Proportional to 1,779.34, 2,455.56 and 1,071.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,779.34 : 2,455.56 = 1,071.31 : x
2. Step 2: Convert to fraction form
   1,779.34/2,455.56 = 1,071.31/x
3. Step 3: Cross multiply
   1,779.34x = 2,455.56 × 1,071.31
4. Step 4: Simplify right side
   1,779.34x = 2,630,665.98
5. Step 5: Solve for x
   x = 2,630,665.98/1,779.34
6. Step 6: Final answer
   x = 1,478.45