Finding the Fourth Proportional to 55,085.31, 76,021.34 and 30,887.91

Step by Step Solution

1. Step 1: Write the proportion equation
   55,085.31 : 76,021.34 = 30,887.91 : x
2. Step 2: Convert to fraction form
   55,085.31/76,021.34 = 30,887.91/x
3. Step 3: Cross multiply
   55,085.31x = 76,021.34 × 30,887.91
4. Step 4: Simplify right side
   55,085.31x = 2,348,140,153.56
5. Step 5: Solve for x
   x = 2,348,140,153.56/55,085.31
6. Step 6: Final answer
   x = 42,627.34