Finding the Fourth Proportional to 1,590.59, 2,384.55 and 666.81

Step by Step Solution

1. Step 1: Write the proportion equation
   1,590.59 : 2,384.55 = 666.81 : x
2. Step 2: Convert to fraction form
   1,590.59/2,384.55 = 666.81/x
3. Step 3: Cross multiply
   1,590.59x = 2,384.55 × 666.81
4. Step 4: Simplify right side
   1,590.59x = 1,590,041.79
5. Step 5: Solve for x
   x = 1,590,041.79/1,590.59
6. Step 6: Final answer
   x = 999.65