Finding the Fourth Proportional to 1,379.15, 2,069.10 and 558.00

Step by Step Solution

1. Step 1: Write the proportion equation
   1,379.15 : 2,069.10 = 558.00 : x
2. Step 2: Convert to fraction form
   1,379.15/2,069.10 = 558.00/x
3. Step 3: Cross multiply
   1,379.15x = 2,069.10 × 558.00
4. Step 4: Simplify right side
   1,379.15x = 1,154,548.85
5. Step 5: Solve for x
   x = 1,154,548.85/1,379.15
6. Step 6: Final answer
   x = 837.15