Finding the Fourth Proportional to 2,978.91, 4,108.93 and 1,916.26

Step by Step Solution

1. Step 1: Write the proportion equation
   2,978.91 : 4,108.93 = 1,916.26 : x
2. Step 2: Convert to fraction form
   2,978.91/4,108.93 = 1,916.26/x
3. Step 3: Cross multiply
   2,978.91x = 4,108.93 × 1,916.26
4. Step 4: Simplify right side
   2,978.91x = 7,873,763.14
5. Step 5: Solve for x
   x = 7,873,763.14/2,978.91
6. Step 6: Final answer
   x = 2,643.17