Finding the Fourth Proportional to 77,071.72, 105,951 and 66,276.84

Step by Step Solution

1. Step 1: Write the proportion equation
   77,071.72 : 105,951 = 66,276.84 : x
2. Step 2: Convert to fraction form
   77,071.72/105,951 = 66,276.84/x
3. Step 3: Cross multiply
   77,071.72x = 105,951 × 66,276.84
4. Step 4: Simplify right side
   77,071.72x = 7,022,097,474.84
5. Step 5: Solve for x
   x = 7,022,097,474.84/77,071.72
6. Step 6: Final answer
   x = 91,111.21