Finding the Fourth Proportional to 49,866.71, 68,779.80 and 30,721.07

Step by Step Solution

1. Step 1: Write the proportion equation
   49,866.71 : 68,779.80 = 30,721.07 : x
2. Step 2: Convert to fraction form
   49,866.71/68,779.80 = 30,721.07/x
3. Step 3: Cross multiply
   49,866.71x = 68,779.80 × 30,721.07
4. Step 4: Simplify right side
   49,866.71x = 2,112,989,222.34
5. Step 5: Solve for x
   x = 2,112,989,222.34/49,866.71
6. Step 6: Final answer
   x = 42,372.75