Finding the Fourth Proportional to 28,117.53, 42,147 and 13,308.84

Step by Step Solution

1. Step 1: Write the proportion equation
   28,117.53 : 42,147 = 13,308.84 : x
2. Step 2: Convert to fraction form
   28,117.53/42,147 = 13,308.84/x
3. Step 3: Cross multiply
   28,117.53x = 42,147 × 13,308.84
4. Step 4: Simplify right side
   28,117.53x = 560,927,679.48
5. Step 5: Solve for x
   x = 560,927,679.48/28,117.53
6. Step 6: Final answer
   x = 19,949.39