Finding the Fourth Proportional to 1,666.60, 2,300.78 and 1,077.47

Step by Step Solution

1. Step 1: Write the proportion equation
   1,666.60 : 2,300.78 = 1,077.47 : x
2. Step 2: Convert to fraction form
   1,666.60/2,300.78 = 1,077.47/x
3. Step 3: Cross multiply
   1,666.60x = 2,300.78 × 1,077.47
4. Step 4: Simplify right side
   1,666.60x = 2,479,021.43
5. Step 5: Solve for x
   x = 2,479,021.43/1,666.60
6. Step 6: Final answer
   x = 1,487.47