Finding the Third Proportional to 191,816 and 290,389.50

Step by Step Solution

1. Step 1: Write the proportion equation
   191,816 : 290,389.50 = 290,389.50 : x
2. Step 2: Convert to fraction form
   191,816/290,389.50 = 290,389.50/x
3. Step 3: Cross multiply
   191,816x = 290,389.50 × 290,389.50
4. Step 4: Simplify right side
   191,816x = 84,326,061,710.25
5. Step 5: Solve for x
   x = 84,326,061,710.25/191,816
6. Step 6: Final answer
   x = 439,619.54