Finding the Fourth Proportional to 65,886.72, 90,940.22 and 59,160.58

Step by Step Solution

1. Step 1: Write the proportion equation
   65,886.72 : 90,940.22 = 59,160.58 : x
2. Step 2: Convert to fraction form
   65,886.72/90,940.22 = 59,160.58/x
3. Step 3: Cross multiply
   65,886.72x = 90,940.22 × 59,160.58
4. Step 4: Simplify right side
   65,886.72x = 5,380,075,859.23
5. Step 5: Solve for x
   x = 5,380,075,859.23/65,886.72
6. Step 6: Final answer
   x = 81,656.46