Finding the Fourth Proportional to 691,667.55, 954,574.61 and 405,428.13

Step by Step Solution

1. Step 1: Write the proportion equation
   691,667.55 : 954,574.61 = 405,428.13 : x
2. Step 2: Convert to fraction form
   691,667.55/954,574.61 = 405,428.13/x
3. Step 3: Cross multiply
   691,667.55x = 954,574.61 × 405,428.13
4. Step 4: Simplify right side
   691,667.55x = 387,011,397,050.64
5. Step 5: Solve for x
   x = 387,011,397,050.64/691,667.55
6. Step 6: Final answer
   x = 559,533.84