Finding the Fourth Proportional to 11,870.31, 16,381.04 and 7,155.51

Step by Step Solution

1. Step 1: Write the proportion equation
   11,870.31 : 16,381.04 = 7,155.51 : x
2. Step 2: Convert to fraction form
   11,870.31/16,381.04 = 7,155.51/x
3. Step 3: Cross multiply
   11,870.31x = 16,381.04 × 7,155.51
4. Step 4: Simplify right side
   11,870.31x = 117,214,598.32
5. Step 5: Solve for x
   x = 117,214,598.32/11,870.31
6. Step 6: Final answer
   x = 9,874.60