Finding the Fourth Proportional to 100,774.31, 139,022.01 and 64,975.82

Step by Step Solution

1. Step 1: Write the proportion equation
   100,774.31 : 139,022.01 = 64,975.82 : x
2. Step 2: Convert to fraction form
   100,774.31/139,022.01 = 64,975.82/x
3. Step 3: Cross multiply
   100,774.31x = 139,022.01 × 64,975.82
4. Step 4: Simplify right side
   100,774.31x = 9,033,068,402.69
5. Step 5: Solve for x
   x = 9,033,068,402.69/100,774.31
6. Step 6: Final answer
   x = 89,636.62