Finding the Fourth Proportional to 1,379.05, 2,068.72 and 557.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,379.05 : 2,068.72 = 557.34 : x
2. Step 2: Convert to fraction form
   1,379.05/2,068.72 = 557.34/x
3. Step 3: Cross multiply
   1,379.05x = 2,068.72 × 557.34
4. Step 4: Simplify right side
   1,379.05x = 1,152,980.40
5. Step 5: Solve for x
   x = 1,152,980.40/1,379.05
6. Step 6: Final answer
   x = 836.07