Finding the Third Proportional to 89,991 and 196,931.25

Step by Step Solution

1. Step 1: Write the proportion equation
   89,991 : 196,931.25 = 196,931.25 : x
2. Step 2: Convert to fraction form
   89,991/196,931.25 = 196,931.25/x
3. Step 3: Cross multiply
   89,991x = 196,931.25 × 196,931.25
4. Step 4: Simplify right side
   89,991x = 38,781,917,226.56
5. Step 5: Solve for x
   x = 38,781,917,226.56/89,991
6. Step 6: Final answer
   x = 430,953.29