Finding the Third Proportional to 272,147 and 429,090

Step by Step Solution

1. Step 1: Write the proportion equation
   272,147 : 429,090 = 429,090 : x
2. Step 2: Convert to fraction form
   272,147/429,090 = 429,090/x
3. Step 3: Cross multiply
   272,147x = 429,090 × 429,090
4. Step 4: Simplify right side
   272,147x = 184,118,228,100
5. Step 5: Solve for x
   x = 184,118,228,100/272,147
6. Step 6: Final answer
   x = 676,539.62