Finding the Fourth Proportional to 59,814.78, 81,946.65 and 57,572.70

Step by Step Solution

1. Step 1: Write the proportion equation
   59,814.78 : 81,946.65 = 57,572.70 : x
2. Step 2: Convert to fraction form
   59,814.78/81,946.65 = 57,572.70/x
3. Step 3: Cross multiply
   59,814.78x = 81,946.65 × 57,572.70
4. Step 4: Simplify right side
   59,814.78x = 4,717,889,896.46
5. Step 5: Solve for x
   x = 4,717,889,896.46/59,814.78
6. Step 6: Final answer
   x = 78,874.99