Finding the Fourth Proportional to 1,978.87, 2,973.70 and 1,055.09

Step by Step Solution

1. Step 1: Write the proportion equation
   1,978.87 : 2,973.70 = 1,055.09 : x
2. Step 2: Convert to fraction form
   1,978.87/2,973.70 = 1,055.09/x
3. Step 3: Cross multiply
   1,978.87x = 2,973.70 × 1,055.09
4. Step 4: Simplify right side
   1,978.87x = 3,137,521.13
5. Step 5: Solve for x
   x = 3,137,521.13/1,978.87
6. Step 6: Final answer
   x = 1,585.51