Finding the Fourth Proportional to 91,421,641.89, 137,152,785.51 and 42,873,620.79

Step by Step Solution

1. Step 1: Write the proportion equation
   91,421,641.89 : 137,152,785.51 = 42,873,620.79 : x
2. Step 2: Convert to fraction form
   91,421,641.89/137,152,785.51 = 42,873,620.79/x
3. Step 3: Cross multiply
   91,421,641.89x = 137,152,785.51 × 42,873,620.79
4. Step 4: Simplify right side
   91,421,641.89x = 5,880,236,516,247,946
5. Step 5: Solve for x
   x = 5,880,236,516,247,946/91,421,641.89
6. Step 6: Final answer
   x = 64,319,961.82