Finding the Fourth Proportional to 61,541, 91,828.47 and 57,779.36

Step by Step Solution

1. Step 1: Write the proportion equation
   61,541 : 91,828.47 = 57,779.36 : x
2. Step 2: Convert to fraction form
   61,541/91,828.47 = 57,779.36/x
3. Step 3: Cross multiply
   61,541x = 91,828.47 × 57,779.36
4. Step 4: Simplify right side
   61,541x = 5,305,789,937.48
5. Step 5: Solve for x
   x = 5,305,789,937.48/61,541
6. Step 6: Final answer
   x = 86,215.53