Finding the Fourth Proportional to 13,830.87, 19,085.85 and 7,861.71

Step by Step Solution

1. Step 1: Write the proportion equation
   13,830.87 : 19,085.85 = 7,861.71 : x
2. Step 2: Convert to fraction form
   13,830.87/19,085.85 = 7,861.71/x
3. Step 3: Cross multiply
   13,830.87x = 19,085.85 × 7,861.71
4. Step 4: Simplify right side
   13,830.87x = 150,047,417.80
5. Step 5: Solve for x
   x = 150,047,417.80/13,830.87
6. Step 6: Final answer
   x = 10,848.73