Finding the Third Proportional to 438,434.50 and 698,172

Step by Step Solution

1. Step 1: Write the proportion equation
   438,434.50 : 698,172 = 698,172 : x
2. Step 2: Convert to fraction form
   438,434.50/698,172 = 698,172/x
3. Step 3: Cross multiply
   438,434.50x = 698,172 × 698,172
4. Step 4: Simplify right side
   438,434.50x = 487,444,141,584
5. Step 5: Solve for x
   x = 487,444,141,584/438,434.50
6. Step 6: Final answer
   x = 1,111,783.27