Finding the Fourth Proportional to 478,256.16, 716,892.15 and 212,142

Step by Step Solution

1. Step 1: Write the proportion equation
   478,256.16 : 716,892.15 = 212,142 : x
2. Step 2: Convert to fraction form
   478,256.16/716,892.15 = 212,142/x
3. Step 3: Cross multiply
   478,256.16x = 716,892.15 × 212,142
4. Step 4: Simplify right side
   478,256.16x = 152,082,934,485.30
5. Step 5: Solve for x
   x = 152,082,934,485.30/478,256.16
6. Step 6: Final answer
   x = 317,994.72