Finding the Fourth Proportional to 2,086.06, 3,128.47 and 1,307.25

Step by Step Solution

1. Step 1: Write the proportion equation
   2,086.06 : 3,128.47 = 1,307.25 : x
2. Step 2: Convert to fraction form
   2,086.06/3,128.47 = 1,307.25/x
3. Step 3: Cross multiply
   2,086.06x = 3,128.47 × 1,307.25
4. Step 4: Simplify right side
   2,086.06x = 4,089,670.23
5. Step 5: Solve for x
   x = 4,089,670.23/2,086.06
6. Step 6: Final answer
   x = 1,960.48