Finding the Fourth Proportional to 1,666.96, 2,499.61 and 556.00

Step by Step Solution

1. Step 1: Write the proportion equation
   1,666.96 : 2,499.61 = 556.00 : x
2. Step 2: Convert to fraction form
   1,666.96/2,499.61 = 556.00/x
3. Step 3: Cross multiply
   1,666.96x = 2,499.61 × 556.00
4. Step 4: Simplify right side
   1,666.96x = 1,389,769.53
5. Step 5: Solve for x
   x = 1,389,769.53/1,666.96
6. Step 6: Final answer
   x = 833.71