Finding the Fourth Proportional to 57,638.84, 86,468.72 and 28,056.72

Step by Step Solution

1. Step 1: Write the proportion equation
   57,638.84 : 86,468.72 = 28,056.72 : x
2. Step 2: Convert to fraction form
   57,638.84/86,468.72 = 28,056.72/x
3. Step 3: Cross multiply
   57,638.84x = 86,468.72 × 28,056.72
4. Step 4: Simplify right side
   57,638.84x = 2,426,028,665.80
5. Step 5: Solve for x
   x = 2,426,028,665.80/57,638.84
6. Step 6: Final answer
   x = 42,090.17