Finding the Fourth Proportional to 1,978.69, 2,972.90 and 1,490.26

Step by Step Solution

1. Step 1: Write the proportion equation
   1,978.69 : 2,972.90 = 1,490.26 : x
2. Step 2: Convert to fraction form
   1,978.69/2,972.90 = 1,490.26/x
3. Step 3: Cross multiply
   1,978.69x = 2,972.90 × 1,490.26
4. Step 4: Simplify right side
   1,978.69x = 4,430,393.95
5. Step 5: Solve for x
   x = 4,430,393.95/1,978.69
6. Step 6: Final answer
   x = 2,239.05