Finding the Fourth Proportional to 903,140.72, 1,355,333.16 and 312,164.72

Step by Step Solution

1. Step 1: Write the proportion equation
   903,140.72 : 1,355,333.16 = 312,164.72 : x
2. Step 2: Convert to fraction form
   903,140.72/1,355,333.16 = 312,164.72/x
3. Step 3: Cross multiply
   903,140.72x = 1,355,333.16 × 312,164.72
4. Step 4: Simplify right side
   903,140.72x = 423,087,196,398.12
5. Step 5: Solve for x
   x = 423,087,196,398.12/903,140.72
6. Step 6: Final answer
   x = 468,462.10