Finding the Third Proportional to 518,188.50 and 1,221,478.50

Step by Step Solution

1. Step 1: Write the proportion equation
   518,188.50 : 1,221,478.50 = 1,221,478.50 : x
2. Step 2: Convert to fraction form
   518,188.50/1,221,478.50 = 1,221,478.50/x
3. Step 3: Cross multiply
   518,188.50x = 1,221,478.50 × 1,221,478.50
4. Step 4: Simplify right side
   518,188.50x = 1,492,009,725,962.25
5. Step 5: Solve for x
   x = 1,492,009,725,962.25/518,188.50
6. Step 6: Final answer
   x = 2,879,279.89