Finding the Fourth Proportional to 20,870.18, 31,307.20 and 7,546.50

Step by Step Solution

1. Step 1: Write the proportion equation
   20,870.18 : 31,307.20 = 7,546.50 : x
2. Step 2: Convert to fraction form
   20,870.18/31,307.20 = 7,546.50/x
3. Step 3: Cross multiply
   20,870.18x = 31,307.20 × 7,546.50
4. Step 4: Simplify right side
   20,870.18x = 236,259,784.80
5. Step 5: Solve for x
   x = 236,259,784.80/20,870.18
6. Step 6: Final answer
   x = 11,320.45