Finding the Third Proportional to 623,178 and 1,355,688

Step by Step Solution

1. Step 1: Write the proportion equation
   623,178 : 1,355,688 = 1,355,688 : x
2. Step 2: Convert to fraction form
   623,178/1,355,688 = 1,355,688/x
3. Step 3: Cross multiply
   623,178x = 1,355,688 × 1,355,688
4. Step 4: Simplify right side
   623,178x = 1,837,889,953,344
5. Step 5: Solve for x
   x = 1,837,889,953,344/623,178
6. Step 6: Final answer
   x = 2,949,221.50