Finding the Fourth Proportional to 100,881.21, 139,066.71 and 64,577.31

Step by Step Solution

1. Step 1: Write the proportion equation
   100,881.21 : 139,066.71 = 64,577.31 : x
2. Step 2: Convert to fraction form
   100,881.21/139,066.71 = 64,577.31/x
3. Step 3: Cross multiply
   100,881.21x = 139,066.71 × 64,577.31
4. Step 4: Simplify right side
   100,881.21x = 8,980,554,042.35
5. Step 5: Solve for x
   x = 8,980,554,042.35/100,881.21
6. Step 6: Final answer
   x = 89,021.08