Finding the Third Proportional to 208,140 and 438,030

Step by Step Solution

1. Step 1: Write the proportion equation
   208,140 : 438,030 = 438,030 : x
2. Step 2: Convert to fraction form
   208,140/438,030 = 438,030/x
3. Step 3: Cross multiply
   208,140x = 438,030 × 438,030
4. Step 4: Simplify right side
   208,140x = 191,870,280,900
5. Step 5: Solve for x
   x = 191,870,280,900/208,140
6. Step 6: Final answer
   x = 921,832.81