Finding the Fourth Proportional to 31,087.72, 42,907.71 and 21,547.81

Step by Step Solution

1. Step 1: Write the proportion equation
   31,087.72 : 42,907.71 = 21,547.81 : x
2. Step 2: Convert to fraction form
   31,087.72/42,907.71 = 21,547.81/x
3. Step 3: Cross multiply
   31,087.72x = 42,907.71 × 21,547.81
4. Step 4: Simplify right side
   31,087.72x = 924,567,182.62
5. Step 5: Solve for x
   x = 924,567,182.62/31,087.72
6. Step 6: Final answer
   x = 29,740.59