Finding the Third Proportional to 64,298.81 and 136,890

Step by Step Solution

1. Step 1: Write the proportion equation
   64,298.81 : 136,890 = 136,890 : x
2. Step 2: Convert to fraction form
   64,298.81/136,890 = 136,890/x
3. Step 3: Cross multiply
   64,298.81x = 136,890 × 136,890
4. Step 4: Simplify right side
   64,298.81x = 18,738,872,100
5. Step 5: Solve for x
   x = 18,738,872,100/64,298.81
6. Step 6: Final answer
   x = 291,434.19