Finding the Fourth Proportional to 138,300.34, 190,807.20 and 83,869.12

Step by Step Solution

1. Step 1: Write the proportion equation
   138,300.34 : 190,807.20 = 83,869.12 : x
2. Step 2: Convert to fraction form
   138,300.34/190,807.20 = 83,869.12/x
3. Step 3: Cross multiply
   138,300.34x = 190,807.20 × 83,869.12
4. Step 4: Simplify right side
   138,300.34x = 16,002,831,953.66
5. Step 5: Solve for x
   x = 16,002,831,953.66/138,300.34
6. Step 6: Final answer
   x = 115,710.72