Finding the Fourth Proportional to 66,021.46, 91,101.43 and 42,162.10

Step by Step Solution

1. Step 1: Write the proportion equation
   66,021.46 : 91,101.43 = 42,162.10 : x
2. Step 2: Convert to fraction form
   66,021.46/91,101.43 = 42,162.10/x
3. Step 3: Cross multiply
   66,021.46x = 91,101.43 × 42,162.10
4. Step 4: Simplify right side
   66,021.46x = 3,841,027,601.80
5. Step 5: Solve for x
   x = 3,841,027,601.80/66,021.46
6. Step 6: Final answer
   x = 58,178.47