Finding the Fourth Proportional to 55,971, 77,239.98 and 30,820.50

Step by Step Solution

1. Step 1: Write the proportion equation
   55,971 : 77,239.98 = 30,820.50 : x
2. Step 2: Convert to fraction form
   55,971/77,239.98 = 30,820.50/x
3. Step 3: Cross multiply
   55,971x = 77,239.98 × 30,820.50
4. Step 4: Simplify right side
   55,971x = 2,380,574,803.59
5. Step 5: Solve for x
   x = 2,380,574,803.59/55,971
6. Step 6: Final answer
   x = 42,532.29