Finding the Fourth Proportional to 55,781, 76,978.32 and 30,631.04

Step by Step Solution

1. Step 1: Write the proportion equation
   55,781 : 76,978.32 = 30,631.04 : x
2. Step 2: Convert to fraction form
   55,781/76,978.32 = 30,631.04/x
3. Step 3: Cross multiply
   55,781x = 76,978.32 × 30,631.04
4. Step 4: Simplify right side
   55,781x = 2,357,925,999.05
5. Step 5: Solve for x
   x = 2,357,925,999.05/55,781
6. Step 6: Final answer
   x = 42,271.13