Finding the Third Proportional to 258,695,155.50 and 387,947,719.50

Step by Step Solution

1. Step 1: Write the proportion equation
   258,695,155.50 : 387,947,719.50 = 387,947,719.50 : x
2. Step 2: Convert to fraction form
   258,695,155.50/387,947,719.50 = 387,947,719.50/x
3. Step 3: Cross multiply
   258,695,155.50x = 387,947,719.50 × 387,947,719.50
4. Step 4: Simplify right side
   258,695,155.50x = 150,503,433,065,250,688
5. Step 5: Solve for x
   x = 150,503,433,065,250,688/258,695,155.50
6. Step 6: Final answer
   x = 581,779,093.52