Finding the Third Proportional to 7,890.75 and 11,870.72

Step by Step Solution

1. Step 1: Write the proportion equation
   7,890.75 : 11,870.72 = 11,870.72 : x
2. Step 2: Convert to fraction form
   7,890.75/11,870.72 = 11,870.72/x
3. Step 3: Cross multiply
   7,890.75x = 11,870.72 × 11,870.72
4. Step 4: Simplify right side
   7,890.75x = 140,913,963.64
5. Step 5: Solve for x
   x = 140,913,963.64/7,890.75
6. Step 6: Final answer
   x = 17,858.12