Finding the Third Proportional to 18,437.63 and 42,990.75

Step by Step Solution

1. Step 1: Write the proportion equation
   18,437.63 : 42,990.75 = 42,990.75 : x
2. Step 2: Convert to fraction form
   18,437.63/42,990.75 = 42,990.75/x
3. Step 3: Cross multiply
   18,437.63x = 42,990.75 × 42,990.75
4. Step 4: Simplify right side
   18,437.63x = 1,848,204,585.56
5. Step 5: Solve for x
   x = 1,848,204,585.56/18,437.63
6. Step 6: Final answer
   x = 100,240.93