Finding the Third Proportional to 42,729 and 90,381

Step by Step Solution

1. Step 1: Write the proportion equation
   42,729 : 90,381 = 90,381 : x
2. Step 2: Convert to fraction form
   42,729/90,381 = 90,381/x
3. Step 3: Cross multiply
   42,729x = 90,381 × 90,381
4. Step 4: Simplify right side
   42,729x = 8,168,725,161
5. Step 5: Solve for x
   x = 8,168,725,161/42,729
6. Step 6: Final answer
   x = 191,175.20