Finding the Fourth Proportional to 171,478.57, 257,123.90 and 53,117.05

Step by Step Solution

1. Step 1: Write the proportion equation
   171,478.57 : 257,123.90 = 53,117.05 : x
2. Step 2: Convert to fraction form
   171,478.57/257,123.90 = 53,117.05/x
3. Step 3: Cross multiply
   171,478.57x = 257,123.90 × 53,117.05
4. Step 4: Simplify right side
   171,478.57x = 13,657,662,786.91
5. Step 5: Solve for x
   x = 13,657,662,786.91/171,478.57
6. Step 6: Final answer
   x = 79,646.47