Finding the Third Proportional to 291,222 and 617,152.50

Step by Step Solution

1. Step 1: Write the proportion equation
   291,222 : 617,152.50 = 617,152.50 : x
2. Step 2: Convert to fraction form
   291,222/617,152.50 = 617,152.50/x
3. Step 3: Cross multiply
   291,222x = 617,152.50 × 617,152.50
4. Step 4: Simplify right side
   291,222x = 380,877,208,256.25
5. Step 5: Solve for x
   x = 380,877,208,256.25/291,222
6. Step 6: Final answer
   x = 1,307,858.64