Finding the Fourth Proportional to 696,697.59, 961,480.71 and 390,870.84

Step by Step Solution

1. Step 1: Write the proportion equation
   696,697.59 : 961,480.71 = 390,870.84 : x
2. Step 2: Convert to fraction form
   696,697.59/961,480.71 = 390,870.84/x
3. Step 3: Cross multiply
   696,697.59x = 961,480.71 × 390,870.84
4. Step 4: Simplify right side
   696,697.59x = 375,814,772,761.50
5. Step 5: Solve for x
   x = 375,814,772,761.50/696,697.59
6. Step 6: Final answer
   x = 539,423.10