Finding the Fourth Proportional to 13,931.48, 20,899.18 and 4,071.50

Step by Step Solution

1. Step 1: Write the proportion equation
   13,931.48 : 20,899.18 = 4,071.50 : x
2. Step 2: Convert to fraction form
   13,931.48/20,899.18 = 4,071.50/x
3. Step 3: Cross multiply
   13,931.48x = 20,899.18 × 4,071.50
4. Step 4: Simplify right side
   13,931.48x = 85,091,011.37
5. Step 5: Solve for x
   x = 85,091,011.37/13,931.48
6. Step 6: Final answer
   x = 6,107.82