Finding the Fourth Proportional to 105,434.91, 145,499.94 and 57,688.16

Step by Step Solution

1. Step 1: Write the proportion equation
   105,434.91 : 145,499.94 = 57,688.16 : x
2. Step 2: Convert to fraction form
   105,434.91/145,499.94 = 57,688.16/x
3. Step 3: Cross multiply
   105,434.91x = 145,499.94 × 57,688.16
4. Step 4: Simplify right side
   105,434.91x = 8,393,623,091.21
5. Step 5: Solve for x
   x = 8,393,623,091.21/105,434.91
6. Step 6: Final answer
   x = 79,609.52