Finding the Fourth Proportional to 1,666.89, 2,499.72 and 1,420.01

Step by Step Solution

1. Step 1: Write the proportion equation
   1,666.89 : 2,499.72 = 1,420.01 : x
2. Step 2: Convert to fraction form
   1,666.89/2,499.72 = 1,420.01/x
3. Step 3: Cross multiply
   1,666.89x = 2,499.72 × 1,420.01
4. Step 4: Simplify right side
   1,666.89x = 3,549,627.40
5. Step 5: Solve for x
   x = 3,549,627.40/1,666.89
6. Step 6: Final answer
   x = 2,129.49