Finding the Fourth Proportional to 55,128.80, 76,120.59 and 42,361.86

Step by Step Solution

1. Step 1: Write the proportion equation
   55,128.80 : 76,120.59 = 42,361.86 : x
2. Step 2: Convert to fraction form
   55,128.80/76,120.59 = 42,361.86/x
3. Step 3: Cross multiply
   55,128.80x = 76,120.59 × 42,361.86
4. Step 4: Simplify right side
   55,128.80x = 3,224,609,776.70
5. Step 5: Solve for x
   x = 3,224,609,776.70/55,128.80
6. Step 6: Final answer
   x = 58,492.29