Finding the Fourth Proportional to 11,870.50, 16,372.38 and 9,992.11

Step by Step Solution

1. Step 1: Write the proportion equation
   11,870.50 : 16,372.38 = 9,992.11 : x
2. Step 2: Convert to fraction form
   11,870.50/16,372.38 = 9,992.11/x
3. Step 3: Cross multiply
   11,870.50x = 16,372.38 × 9,992.11
4. Step 4: Simplify right side
   11,870.50x = 163,594,621.92
5. Step 5: Solve for x
   x = 163,594,621.92/11,870.50
6. Step 6: Final answer
   x = 13,781.61