Finding the Fourth Proportional to 369,123.36, 553,685.20 and 102,890.72

Step by Step Solution

1. Step 1: Write the proportion equation
   369,123.36 : 553,685.20 = 102,890.72 : x
2. Step 2: Convert to fraction form
   369,123.36/553,685.20 = 102,890.72/x
3. Step 3: Cross multiply
   369,123.36x = 553,685.20 × 102,890.72
4. Step 4: Simplify right side
   369,123.36x = 56,969,068,881.34
5. Step 5: Solve for x
   x = 56,969,068,881.34/369,123.36
6. Step 6: Final answer
   x = 154,336.12