Finding the Fourth Proportional to 20,870.60, 31,278.18 and 7,710.84

Step by Step Solution

1. Step 1: Write the proportion equation
   20,870.60 : 31,278.18 = 7,710.84 : x
2. Step 2: Convert to fraction form
   20,870.60/31,278.18 = 7,710.84/x
3. Step 3: Cross multiply
   20,870.60x = 31,278.18 × 7,710.84
4. Step 4: Simplify right side
   20,870.60x = 241,181,041.47
5. Step 5: Solve for x
   x = 241,181,041.47/20,870.60
6. Step 6: Final answer
   x = 11,556.02