Finding the Fourth Proportional to 105,556.21, 145,667.52 and 57,158.13

Step by Step Solution

1. Step 1: Write the proportion equation
   105,556.21 : 145,667.52 = 57,158.13 : x
2. Step 2: Convert to fraction form
   105,556.21/145,667.52 = 57,158.13/x
3. Step 3: Cross multiply
   105,556.21x = 145,667.52 × 57,158.13
4. Step 4: Simplify right side
   105,556.21x = 8,326,082,284.34
5. Step 5: Solve for x
   x = 8,326,082,284.34/105,556.21
6. Step 6: Final answer
   x = 78,878.19