Finding the Third Proportional to 149,490 and 218,479.50

Step by Step Solution

1. Step 1: Write the proportion equation
   149,490 : 218,479.50 = 218,479.50 : x
2. Step 2: Convert to fraction form
   149,490/218,479.50 = 218,479.50/x
3. Step 3: Cross multiply
   149,490x = 218,479.50 × 218,479.50
4. Step 4: Simplify right side
   149,490x = 47,733,291,920.25
5. Step 5: Solve for x
   x = 47,733,291,920.25/149,490
6. Step 6: Final answer
   x = 319,307.59