Finding the Fourth Proportional to 11,856.12, 16,360.98 and 7,139.40

Step by Step Solution

1. Step 1: Write the proportion equation
   11,856.12 : 16,360.98 = 7,139.40 : x
2. Step 2: Convert to fraction form
   11,856.12/16,360.98 = 7,139.40/x
3. Step 3: Cross multiply
   11,856.12x = 16,360.98 × 7,139.40
4. Step 4: Simplify right side
   11,856.12x = 116,807,580.61
5. Step 5: Solve for x
   x = 116,807,580.61/11,856.12
6. Step 6: Final answer
   x = 9,852.09