Finding the Fourth Proportional to 103,430, 142,733.40 and 56,326

Step by Step Solution

1. Step 1: Write the proportion equation
   103,430 : 142,733.40 = 56,326 : x
2. Step 2: Convert to fraction form
   103,430/142,733.40 = 56,326/x
3. Step 3: Cross multiply
   103,430x = 142,733.40 × 56,326
4. Step 4: Simplify right side
   103,430x = 8,039,601,488.40
5. Step 5: Solve for x
   x = 8,039,601,488.40/103,430
6. Step 6: Final answer
   x = 77,729.88