Finding the Fourth Proportional to 55,690.72, 76,859.52 and 31,820.80

Step by Step Solution

1. Step 1: Write the proportion equation
   55,690.72 : 76,859.52 = 31,820.80 : x
2. Step 2: Convert to fraction form
   55,690.72/76,859.52 = 31,820.80/x
3. Step 3: Cross multiply
   55,690.72x = 76,859.52 × 31,820.80
4. Step 4: Simplify right side
   55,690.72x = 2,445,731,414.02
5. Step 5: Solve for x
   x = 2,445,731,414.02/55,690.72
6. Step 6: Final answer
   x = 43,916.32