Finding the Third Proportional to 42,020,688 and 90,318,768

Step by Step Solution

1. Step 1: Write the proportion equation
   42,020,688 : 90,318,768 = 90,318,768 : x
2. Step 2: Convert to fraction form
   42,020,688/90,318,768 = 90,318,768/x
3. Step 3: Cross multiply
   42,020,688x = 90,318,768 × 90,318,768
4. Step 4: Simplify right side
   42,020,688x = 8,157,479,853,037,824
5. Step 5: Solve for x
   x = 8,157,479,853,037,824/42,020,688
6. Step 6: Final answer
   x = 194,130,087.85