Finding the Fourth Proportional to 101,528.84, 139,796.84 and 90,178.61

Step by Step Solution

1. Step 1: Write the proportion equation
   101,528.84 : 139,796.84 = 90,178.61 : x
2. Step 2: Convert to fraction form
   101,528.84/139,796.84 = 90,178.61/x
3. Step 3: Cross multiply
   101,528.84x = 139,796.84 × 90,178.61
4. Step 4: Simplify right side
   101,528.84x = 12,606,683,563.72
5. Step 5: Solve for x
   x = 12,606,683,563.72/101,528.84
6. Step 6: Final answer
   x = 124,168.50