Finding the Fourth Proportional to 77,071.50, 115,607.28 and 21,667.50

Step by Step Solution

1. Step 1: Write the proportion equation
   77,071.50 : 115,607.28 = 21,667.50 : x
2. Step 2: Convert to fraction form
   77,071.50/115,607.28 = 21,667.50/x
3. Step 3: Cross multiply
   77,071.50x = 115,607.28 × 21,667.50
4. Step 4: Simplify right side
   77,071.50x = 2,504,920,739.40
5. Step 5: Solve for x
   x = 2,504,920,739.40/77,071.50
6. Step 6: Final answer
   x = 32,501.26