Finding the Fourth Proportional to 7,111.98, 10,666.74 and 1,916.64

Step by Step Solution

1. Step 1: Write the proportion equation
   7,111.98 : 10,666.74 = 1,916.64 : x
2. Step 2: Convert to fraction form
   7,111.98/10,666.74 = 1,916.64/x
3. Step 3: Cross multiply
   7,111.98x = 10,666.74 × 1,916.64
4. Step 4: Simplify right side
   7,111.98x = 20,444,300.55
5. Step 5: Solve for x
   x = 20,444,300.55/7,111.98
6. Step 6: Final answer
   x = 2,874.63