Finding the Fourth Proportional to 61,031.29, 91,089.38 and 57,045.46

Step by Step Solution

1. Step 1: Write the proportion equation
   61,031.29 : 91,089.38 = 57,045.46 : x
2. Step 2: Convert to fraction form
   61,031.29/91,089.38 = 57,045.46/x
3. Step 3: Cross multiply
   61,031.29x = 91,089.38 × 57,045.46
4. Step 4: Simplify right side
   61,031.29x = 5,196,235,583.21
5. Step 5: Solve for x
   x = 5,196,235,583.21/61,031.29
6. Step 6: Final answer
   x = 85,140.52