Finding the Third Proportional to 428,172 and 602,428

Step by Step Solution

1. Step 1: Write the proportion equation
   428,172 : 602,428 = 602,428 : x
2. Step 2: Convert to fraction form
   428,172/602,428 = 602,428/x
3. Step 3: Cross multiply
   428,172x = 602,428 × 602,428
4. Step 4: Simplify right side
   428,172x = 362,919,495,184
5. Step 5: Solve for x
   x = 362,919,495,184/428,172
6. Step 6: Final answer
   x = 847,602.12