Finding the Fourth Proportional to 61,030.79, 91,088.64 and 57,044.96

Step by Step Solution

1. Step 1: Write the proportion equation
   61,030.79 : 91,088.64 = 57,044.96 : x
2. Step 2: Convert to fraction form
   61,030.79/91,088.64 = 57,044.96/x
3. Step 3: Cross multiply
   61,030.79x = 91,088.64 × 57,044.96
4. Step 4: Simplify right side
   61,030.79x = 5,196,147,825.25
5. Step 5: Solve for x
   x = 5,196,147,825.25/61,030.79
6. Step 6: Final answer
   x = 85,139.78