Finding the Fourth Proportional to 3,945.18, 5,916.54 and 1,312.12

Step by Step Solution

1. Step 1: Write the proportion equation
   3,945.18 : 5,916.54 = 1,312.12 : x
2. Step 2: Convert to fraction form
   3,945.18/5,916.54 = 1,312.12/x
3. Step 3: Cross multiply
   3,945.18x = 5,916.54 × 1,312.12
4. Step 4: Simplify right side
   3,945.18x = 7,763,210.46
5. Step 5: Solve for x
   x = 7,763,210.46/3,945.18
6. Step 6: Final answer
   x = 1,967.77