Finding the Fourth Proportional to 3,910.01, 5,865.89 and 1,312.88

Step by Step Solution

1. Step 1: Write the proportion equation
   3,910.01 : 5,865.89 = 1,312.88 : x
2. Step 2: Convert to fraction form
   3,910.01/5,865.89 = 1,312.88/x
3. Step 3: Cross multiply
   3,910.01x = 5,865.89 × 1,312.88
4. Step 4: Simplify right side
   3,910.01x = 7,701,173.77
5. Step 5: Solve for x
   x = 7,701,173.77/3,910.01
6. Step 6: Final answer
   x = 1,969.61