Finding the Third Proportional to 25,689,945 and 42,173,914.50

Step by Step Solution

1. Step 1: Write the proportion equation
   25,689,945 : 42,173,914.50 = 42,173,914.50 : x
2. Step 2: Convert to fraction form
   25,689,945/42,173,914.50 = 42,173,914.50/x
3. Step 3: Cross multiply
   25,689,945x = 42,173,914.50 × 42,173,914.50
4. Step 4: Simplify right side
   25,689,945x = 1,778,639,064,253,310.25
5. Step 5: Solve for x
   x = 1,778,639,064,253,310.25/25,689,945
6. Step 6: Final answer
   x = 69,234,833.48