Finding the Fourth Proportional to 7,109.78, 10,663.86 and 1,916.06

Step by Step Solution

1. Step 1: Write the proportion equation
   7,109.78 : 10,663.86 = 1,916.06 : x
2. Step 2: Convert to fraction form
   7,109.78/10,663.86 = 1,916.06/x
3. Step 3: Cross multiply
   7,109.78x = 10,663.86 × 1,916.06
4. Step 4: Simplify right side
   7,109.78x = 20,432,595.59
5. Step 5: Solve for x
   x = 20,432,595.59/7,109.78
6. Step 6: Final answer
   x = 2,873.87