Finding the Third Proportional to 28,720,376 and 42,978,990

Step by Step Solution

1. Step 1: Write the proportion equation
   28,720,376 : 42,978,990 = 42,978,990 : x
2. Step 2: Convert to fraction form
   28,720,376/42,978,990 = 42,978,990/x
3. Step 3: Cross multiply
   28,720,376x = 42,978,990 × 42,978,990
4. Step 4: Simplify right side
   28,720,376x = 1,847,193,581,420,100
5. Step 5: Solve for x
   x = 1,847,193,581,420,100/28,720,376
6. Step 6: Final answer
   x = 64,316,483.23