Finding the Fourth Proportional to 52,426.28, 78,638.94 and 21,254.12

Step by Step Solution

1. Step 1: Write the proportion equation
   52,426.28 : 78,638.94 = 21,254.12 : x
2. Step 2: Convert to fraction form
   52,426.28/78,638.94 = 21,254.12/x
3. Step 3: Cross multiply
   52,426.28x = 78,638.94 × 21,254.12
4. Step 4: Simplify right side
   52,426.28x = 1,671,401,467.43
5. Step 5: Solve for x
   x = 1,671,401,467.43/52,426.28
6. Step 6: Final answer
   x = 31,880.99